I had the same thing. They had my video cord reversed in the back if the fusion. You can take off the front panel and there is two screws that hold it into cabinet. You will see wires with caps. I plugged into those and got it to work. You have an a and b for outside or inside. With some experimentation I got it to work. Been a few months so I can't give you defined steps but that is the jest of what I had to do.
2016 Grey Wolf 26rr
2005 Honda VTX 1300
2002 F150 5.4L extended cab 6.5 bed
Ron & Shirley (Empty Nesters)